What are the achievements of Pythagoras?

Answer 1

Pythagoras is credited with publishing what is today called the Pythagorean Theorem, which describes the relationships of the sides of a right triangle.

Pythagoras did not invent this idea, nor was he first to publish it. The concept was known in at least 7 cultures around the world. A Chinese clay tablet shows the concept being taught in school about 950 years before Pythagoras was born. It shows up in India, Africa, America, Egypt, and elsewhere before the modern name was applied.